APA

Tillich P., . (1952). The courage to be. New Haven: Yale University Press.

Chicago

Tillich Paul, . 1952. The courage to be. New Haven: Yale University Press.

Harvard

Tillich P., . (1952). The courage to be. New Haven: Yale University Press.

MLA

Tillich Paul, . The courage to be. New Haven: Yale University Press. 1952.